28421771 has 4 divisors (see below), whose sum is σ = 32482032. Its totient is φ = 24361512.

The previous prime is 28421749. The next prime is 28421779. The reversal of 28421771 is 17712482.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17712482 = 2 ⋅8856241.

It is not a de Polignac number, because 28421771 - 2¹⁰ = 28420747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28421779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2030120 + ... + 2030133.

It is an arithmetic number, because the mean of its divisors is an integer number (8120508).

Almost surely, 2^28421771 is an apocalyptic number.

28421771 is a deficient number, since it is larger than the sum of its proper divisors (4060261).

28421771 is an equidigital number, since it uses as much as digits as its factorization.

28421771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060260.

The product of its digits is 6272, while the sum is 32.

The square root of 28421771 is about 5331.2072741547. The cubic root of 28421771 is about 305.1760016160.

It can be divided in two parts, 28421 and 771, that added together give a palindrome (29192).

The spelling of 28421771 in words is "twenty-eight million, four hundred twenty-one thousand, seven hundred seventy-one".